Origanum oil is distilled from the dried flowering herb, Thymus capitatus. It is a compact, woody perennial native to Mediterranean Europe and Turkey, more commonly known as conehead thyme, Persian-hyssop and Spanish oregano. It is also known under the name Thymbra capitata.
Origanum Oil (aromatherapy)
Spanish or Israeli Origanum Oil is a dark brownish-red or grayish-red or purple to dark orange colored liquid, possessing a strong, tar-like, herbaceous, but very refreshing odor. The topnote is slightly green-camphoraceous, herbaceous, and the body is rich, dry-woody, somewhat reminiscent of cade and phenols (“hospital-odor”, “medicinal odor”). On drying out, the odor becomes sweeter, but remains phenolic-dry and woody (as distinguished from the dryout of thyme oil). The flavor is somewhat burning, warm-phenolic (“hospital- like”) with a rich herbaceous undertone. The flavor becomes fairly pleasant only in high dilution.
Arctander, Steffen . Perfume and Flavor Materials of Natural Origin (p. 572).